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RE: Limits on referential integrity

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Tue, 22 Jan 2002 08:14:22 -0800
Message-ID: <F001.003F6F95.20020122055529@fatcity.com>

Craig - Thanks for mentioning this J2EE fact. Currently the developers are using JDBC, but we are trying to decide if we should move up to J2EE. I spent this weekend reading "Java Programming with Oracle JDBC" by Don Bales which has just been published, ink still wet. Seems to be a good book, but I'm not knowledgeable enough yet to judge. Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, January 21, 2002 5:00 PM
To: Multiple recipients of list ORACLE-L

Jared and Dennis,

In the J2EE world I've found that developers can have a little trouble with RI because in some cases it is not the developer that is performing the DML operations - the J2EE container does this for them when using Container Managed Persistence (CMP). Some CMP implementations do not understand RI yet, and this is especially true when multiple containers are used in the middle tier - that is, there is no/little coordination between the containers to issue the DML in the correct order.

Cheers,
Craig.

-----Original Message-----
<mailto:Jared.Still_at_radisys.com> ]
Sent: Tuesday, 22 January 2002 9:16 AM
To: Multiple recipients of list ORACLE-L

I would be you lunch that what they are implementing in their code is not actually RI. They may be implementing code to ensure things get inserted in the right order, and that child rows have a parent.

This is a very weak form of RI. Oracle is very good at implementing RI, and it is not dependent on an application. RI in the database is the route to choose unless there is some good reason not to.

RI in the database will prevent orphaned data created through updates, deletes or even ( gasp! ) bugs in the app.

Programmers tend to dislike RI in the database because it forces them to maintain data integrity in a transaction. This is not a bad thing, it just forces them to have a good understanding of their transactions.

Point out to them that it is less code to write as well. :)

Jared

DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM> Sent by: root_at_fatcity.com
01/21/02 01:35 PM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> 
        cc: 
        Subject:        Limits on referential integrity 


How much referential integrity should be implemented in Oracle? We are starting a large new Java project. Our current applications keep their referential integrity inside their own dictionary, so I haven't had to deal
much with referential integrity recently. Can there be too much of a good thing? What guidelines do you tend to use? At this point the developers are
designing the data model so they are busily linking all the little boxes. My
attitude at this point is "implement what you've got and if there are performance problems we'll deal with them when they arise". Can anyone give
me a better motto?
Thanks.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

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Author:
  INET: Jared.Still_at_radisys.com

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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Tue Jan 22 2002 - 10:14:22 CST

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